Process for increasing the affinity of animal fibers for dyestuffs



Patented Mar. 13, 1928.

. UNlTED STATES PATENT OFFICE.

V ERNST STOCKER, OF BASEL, SWITZERLAND, ASSIGNOR TO THE FIRM CHEMICAL IWORKS FORMERLY SANDOZ, F BASEL, SWITZERLAND.

PROCESS FOR INCREASING THE AFFINITY OF ANIMAL FIBERS FOR DYESTUI'II'B.

No Drawing. Application filed October 27, 1927, Serial N'o. 229,272, and in Germany November 20, 1928.

In the German specification No. 448,797 a process is described which consists in a treatment of animal fibers with acylating agents, as for instance halides of carboxylic and organic sulpho acids. The fibers thus treated show an increased aflinity for all dyestufi's with the exception of the basic colors.

It has now been found, that if animal fibers are treated in an analogous manner with sulphuryl chloride, fibers can be obtained which possess similar properties; they show an increased afiinity for all classes of dye stufi's including the basic colors. It is a0 vantageous to carry out this treatment in indifferent organic solvents, benzene. toluene, hydrogenized aromatic hydrocarbons, aliphatic hydrocarbons as well as the halogen derivatives of these comm 'pounds.

1 E warm ples.

700 g. of wool are worked for an hour at room temperature in 5 litres of a 7 ,5% solufor example tion of sulphuryl chloride in toluene. The fibers are afterwards thoroughly hydroextracted, washed in water, passed through a soap solution, again washed in water and then dried. The wool thus treated shows a considerably increased afiinity for all classes of dyestuffs. The quantity and concentration of the solution as Well as the duration of the treatment may be varied to a. large extent.

\Vhat I claim is 1. A process for increasing the afiinity of animal fibers for dyestufis, consisting in treating animal fibers with sulphuryl chlo- 2. A process for increasing the aflinity of 4 animal fibers for dyestuffs, consisting in treating animal fibers with sulphuryl chloride in the presence of indifierent organic solvents.

In witness whereof I have hereunto signed my name this 15th day of October, 1927 ERNST STOCKER. 

